WGU C839-Practice test Questions and Answers Already Passed

WGU C839-Practice test Questions and
Answers Already Passed
What term from the list below best describes a data concealment for covert communication that
makes use of LSB replacement?


-Crypanalysis
-Stegnalysis
-Steganography
-Whitening ✔✔Steganography


Which block cipher below uses a block size of 128 bits and key sizes up to 256 bits?


-DES
-Blowfish
-TwoFish
-Tiger ✔✔TwoFish


Symmetric encryptionm is expressed mathematically as :


- C=E(k,p)
- P= E(k,c)
- Me % n
- y^2 = x^3 + Ax +B ✔✔C = E (k,p)


Name all the Hashing algorithms ✔✔- Tiger
- SHA256
- Fork256
- SHA1
- Gost

,- MD5
- RIPEMD-160


What is the has value for TIGER? ✔✔192 bit


What is the hash value for SHA256? ✔✔128 Bit


What is the hash value for FORK 256? ✔✔128 bit


What is the hash value for SHA1? ✔✔160 Bit


What is the hash value of GOST? ✔✔256 bit


What is the hash value of MD5? ✔✔128 Bit


What is the hash value of RIPEMD-160 ✔✔160 bit


What are all they symmetric block ciphers? ✔✔- AES
- IDEA
- DES
- Blowfish
- TwoFish
- Skipjack
- Serpent


What is the block and key size for AES? ✔✔- 128 bit block
- 128, 192 and 256 bit key


What is the block and key size for DES? ✔✔- 64 bit block
- 56 bit key

, What is the block and key size for IDEA? ✔✔- 64 bit block
- 128 bit key


What is the block and key size for Blowfish ✔✔- 64 bit block
- 32-448 bit key


What is the block and key size for TwoFish? ✔✔- 128 bit block size
- 1-256 bit key


What is the block and key size for SkipJack? ✔✔- 64 bit block
- 80 bit key


What is the block and key size for Serpent? ✔✔- 128 bit block size
- 128, 192 and 256 bit key sizes


Which of the following are asymmetric encryption algorithms?


- RSA
- MD5
- ECC
- RIPEMD-160
- IDEA
- AES
- DSA
- OFB ✔✔-RSA
-DSA
-ECC


Which of the following are symmetric stream ciphers?